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January 2016
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Ten Mile Raspberry Pi WiFi (with a Catch)

How would you like to have a WiFi connection that covers 10 miles? Or how about an even wider network made up of a mesh of multiple nodes? It is possible, but there is a catch: you probably need a ham radio license to do it (at least, you do in the United States).

What makes it possible is the realization that conventional WiFi channels 1-6 are inside an existing US ham band. That means (if you are a ham) you can elect to use FCC part 97 rules instead of part 15 that governs WiFi routers. That means you …read more

WiFi Alliance Introduces 802.11ah

For the last decade or so, wireless networking has been entirely about short range, high speed communications. The type of networking needed by an Internet of things is fundamentally incompatible with WiFi, and the reason for this is due to the frequencies used by WiFi networking gear. 2.4 and 5 GHz are very fast, but cannot penetrate through walls as easily as lower frequencies.

This week the WiFi alliance introduced IEEE 802.11ah into the WiFi spec. It’s called WiFi HaLow (pronounced like angel’s headwear), and unlike other versions of 802.11, WiFi HaLow uses low frequencies for low bandwidth but a …read more

Henry Smolinski and the Flying Pinto

Anyone who has ever been stuck in gridlock has probably daydreamed about pushing a button on the dashboard that turns their car into a plane. Imagine how much more relaxing a weekend getaway would be if you could take to the open sky instead hitting the congested highway. For as long as there have been aircraft and automobiles, man has tried to combine the two. The proper term for this marriage is ‘roadable aircraft’, and a successful one requires attention to the aerodynamics of flight as well as the rigors of motoring.

One promising attempt at a roadable aircraft came …read more

Paddy Neumann’s Bounce Per Ounce is Better Than NASA’s

[Paddy Neumann] is an Australian physicist and founder of Neumann Space, a space start-up with a record-breaking ion drive.

The team at Neumann Space built an ion engine that broke the previous specific impulse (bounce per ounce) record. NASA’s HIPEP thruster previously held this record with a specific impulse of ~9600 seconds (+/- 200 seconds). The Neumann Drive’s specific impulse as recorded by the University of Sydney was ~14,690 seconds (+/- 2,000 seconds). This all equates to better efficiency by the Neumann Drive, however its acceleration does not match that of the HIPEP.

The Neumann Drive has another unique advantage …read more

The Unreasonable Effectiveness of Adhesive Tape

No doubt many of you have spent a happy Christmas tearing away layers of wrapping paper to expose some new gadget. But did you stop to spare a thought for the “sticky-back plastic” holding your precious gift paper together?

There are a crazy number of adhesive tapes available, and in this article I’d like to discuss a few of the ones I’ve found useful in my lab, and their sometimes surprising applications. I’d be interested in your own favorite tapes and adhesives too, so please comment below!

But first, I’d like to start with the tapes that I don’t use. …read more

From The Blog

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  • The Most Plausible Apollo Moon Landing Conspiracy Ever Devised

    30 Comments

    By Brian Benchoff | January 6, 2016

    The Internet is polluted with craziness, and there is no better example than YouTube. If you’ve ever wondered what would happen when you give everyone on the planet the power to show everyone else on the planet their innermost thoughts, desires, and insane ramblings, you need only look at YouTube.

    One of the biggest offenders of incoherent ramblings is the subject of spaceflight. Simply search ‘space shuttle’ on YouTube, and you’ll find accusations of the crew of Columbia being abducted by aliens. Crazy, incoherent, and somewhat insulting. Accusations of a moon landing conspiracy are unavoidable in the ‘related videos’ section …read more

  • The 3D Printers of CES

    12 Comments

    By Brian Benchoff | January 6, 2016

    CES, the Consumer Electronics Show, is in full swing. That means the Hackaday tip line is filled to the brim with uninteresting press releases, and notices that companies from the world over will be at CES.

    3D printing has fallen off the radar of people who worship shiny new gadgets of late, and this is simply a function of 3D printing falling into the trough of disillusionment. The hype train of 3D printing is stuck on a siding, people are bored, but this is the time that will shape what 3D printing will become for the next ten years. What …read more

  • Hack Your Brain: the McCollough Effect

    37 Comments

    By Brandon Dunson | January 6, 2016

    There is a fascinating brain reaction known as the McCollough Effect which is like side-loading malicious code through your eyeballs. Although this looks and smells like an optical illusion, the science would argue otherwise. What Celeste McCollough observed in 1965 can be described as a contingent aftereffect although we refer to this as “The McCollough Effect” due to McCollough being the first to recognize this phenomena. It’s something that can’t be unseen… sometimes affecting your vision for months!

    I am not suggesting that you experience the McCollough Effect yourself. We’ll look at the phenomena of the McCollough Effect, and it …read more

  • BabyBaby: A 1948 Computer on an FPGA

    7 Comments

    By Al Williams | January 6, 2016

    The Manchester Baby seems simple today. A 32-bit machine with 32 words of storage. It wasn’t meant to be a computer, though, but a test bed for the new Williams tube storage device. However, in 1948, it executed stored programs at about 1,100 instructions per second. The success of the machine led to a series of computers at Manchester University and finally to the first commercially available computer, the Ferranti Mark I.

    [Dave] is lucky enough to volunteer to demonstrate the Baby replica at Machester’s Museum of Science Industry. He wanted his own Baby, so he used a Xilinx FPGA …read more

  • Android Set Top Box Lets You Stream and Record via HDMI Input

    16 Comments

    By Brandon Dunson | January 6, 2016

    While on the hunt for some hardware that would let him stream video throughout his LAN [danman] got a tip to try the €69 Tronsmart Pavo M9 (which he points out is a re-branded Zidoo X9). With some handy Linux terminal work and a few key pieces of software [danman] was able to get this going.

    The Android box was able to record video from the HDMI input with pre-installed software found in the main menu as [danman] explains on his blog. File format options are available in the record menu, however none of them were suitable for streaming the …read more

  • Ten Mile Raspberry Pi WiFi (with a Catch)

    30 Comments

    By Al Williams | January 5, 2016

    How would you like to have a WiFi connection that covers 10 miles? Or how about an even wider network made up of a mesh of multiple nodes? It is possible, but there is a catch: you probably need a ham radio license to do it (at least, you do in the United States).

    What makes it possible is the realization that conventional WiFi channels 1-6 are inside an existing US ham band. That means (if you are a ham) you can elect to use FCC part 97 rules instead of part 15 that governs WiFi routers. That means you …read more

  • ESP8266 GoPro Remote Adds Buttons, Screen

    4 Comments

    By Richard Baguley | January 5, 2016

    Last year we featured a GoPro camera remote by [Robert Stefanowicz] that was built around an ESP8266. [Robert] has been working hard on improving this project, and has just released version 2, which adds a screen and multiple buttons. These additions allow the remote to become a two-way device: you can use it to monitor the status of the GoPro, keeping an eye on things like the battery level and the current video mode.

    [Robert] decided to make his own PCB to do this, so it’s also a good intro into the stinky art of PCB etching. He isn’t finished yet, …read more

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